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Guided inquiry demonstrates how concentration affects reaction rates in chemical systems, indicating important principles of chemistry.
The rate of a reaction is vital to any chemical system. The rate of a chemical reaction can be influenced markedly by changes in concentration of reactants, temperature, surface area, action of catalysts, and the nature of the reactant. The effect of concentrations on the rate of reaction between potassium iodate (KIO3) and sodium sulfite (Na2SO3) solutions was investigated using starch as an indicator. Using the slopes of average tangent lines, the overall rates of the reactions were determined to be 2×10–4 and 2×10–5 mol/(L×s) for KIO3 and Na2SO3, respectively. In order to gain a better understanding of rates of reaction, the principles of activation energy, catalysts, and collision theory were used to rationalize the data.
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Rugutt et al. (2013) studied this question.
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